Wow, thank you! I created a list of sounds I would want to implement like the "Gooo" when you start the game and the "Ouch" when you get hit. But I seriously never thought about making an end sound like you suggested. No idea how I could not think of that, but it would have been a great addition!
I usually use Left Click to sing, no idea if it's better. And I think I should have lowered the difficulty a bit more (Already lowered it after I have let friends playtest it 2 hours before the deadline) My best was 91, but you just gain so much experience playing the game while developing.